Sparking-coil.



Patented Jan. 7, |902.

' M. I-l. MOFFETT.

SPABKING COIL. (Application mod l'e'b. 9, 1901.) (un Model.)

- NITED STATES PATENT' OFFICE.

MARCUS H. MOFFETT, OF CLEVELAND, OHIO, ASSIGNOR TO THE NATIONAL CARBONCOMPANY, OF CLEVELAND, OHIO, A CORPORATION OF NEW JERSEY.

SPARKING-COIL.

SPECIFICATION forming part of Letters Patent No. 690,750, dated January'7, 1902. Application iiledTebruary 9, 1901. Serial No. 46,662. (Nomodel.)

To all whom it may concern:

Be it known that I, MARCUS H. MOFFETT, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in sparking-Coils, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawing.

The invention relates to a sparking-coil or, more exactly, to the meanswhereby such a coil is protected from injury and Vis rendered fool-proofwithout impairing its efciency.

The invention consists in the construction and combination of partshereinafter described and claimed.

In the drawing the gure is a central vertical sectional View showing myinvention.

Referringtothe parts by letters, A represents a sparking-coil ofordinary construction, and B represents a metal case in which it issealed. The spool of the coil has end iianges c c', made of wood or someother nonconductor, which flanges are of slightly greater diameter thanthe wire coils D and substantially t the case B. I

K represents an insulating-disk, which is placed in the bottom of thecase to protect the core J from contact with the case.

The terminal wires of the coil pass out through openings in the upperhead c. It is most convenient to have the opening through which theterminal from theinnermost turn of the coil passes simply a drilledhole, as shown at the right of the figure, while the terminal from theoutermost turn is more easily accommodated by a slotted opening, asshown at the left of the head c.

The binding-posts E E of the coils pass through and are secured to, butare insulated from, the cover b of the case, and the ends of the wiresct d' of the coil are secured to said binding-posts inside the cover. Aninsulating-ring F, preferably made of wood and of substantially the samediameter as the anges c c', rests upon the upper ange c and surroundsthe ends of the wires a, a', the inner ends of the bindin gposts, andthe connections between said wires and binding-posts, thereby protectingthem. After the coil and this ring have been placed in the case thecover b is soldered or otherwise sealed to the top ot' said case. Thecoil is thereby protected from moisture, from mechanical injury, and:from all danger that the connections between the wires andbinding-posts shall be tampered with; but the efficiency of the coil isnot in any wise impaired.

'. Gr represents a strip of insulating material through which thebinding-posts pass andl which lies between .the enlarged end of saidbinding-posts and said cover.

' H represents insulating-washers, which embrace the threaded inner endsof the bindingposts and lie between the nuts I I and the cover, saidinner ends of the binding-posts, washers, nuts, and ends a' lying, asbefore stated, in the space within the ringFandbetween the upper ange cand the cover of the case.

Having described my invention, I claiml. A sparking-coil consisting ofamore having a head at each end and a coil of wire around the corebetween the heads, the terminal wires of said coil extending throughopenings in the upper head, combined with a metallic case snuglyembracing the coil and extending beyond the upper end thereof, a

distance-ring within the case outside of said terminal wires at theupper end of the coil and substantially llin g the space to the head ofthe case, a metallic head for said case, and a pair of binding-postsinsulatingly carried by said head and projecting into the space withinsaid distance-ring, said terminal wires being clamped to saidbinding-posts within said space, substantially as described.

2. A sparking-coil consisting of a central core, a pair of circularinsulating-heads surrounding the core at each end'and a coil of wirearound the core between the heads, terminals of said coil projectingV atone end through openings in the head, combined with a cylindricalmetallic case snugly embracing the coil and extending beyond the endthereof, an insulating distance-ring within the casenroundsaidprojeetingterminals and between teriel clamping the ends ofsaid terminals, the adjacent head of the coil and the end ofsubstantially as described.

lO the ease, the case being sealed up by an end In testimony whereof Ihereunto aix my plate, insulating material on the inner side signaturein the presence of two Witnesses. and outer side of said end plate,binding- MARCUS H. MOFFETT. posts extending through said insulating malWitnesses:

teriztl and clamped thereto, and binding-nuts E. B. GILCHRIST,

on the inner side of the inner insulating ma.- l

E. L. THURSTON.

